On 25.01.2015 10:13, Sneeker Yeh wrote:
Oh, and one more thing:
>
> +static void xhci_try_to_clear_csc(struct usb_hcd *hcd, int dev_port_num)
> +{
> + int max_ports;
> + struct xhci_hcd *xhci = hcd_to_xhci(hcd);
> + __le32 __iomem **port_array;
> + u32 status;
> +
> + /* print debug info */
> + if (hcd->speed == HCD_USB3) {
> + max_ports = xhci->num_usb3_ports;
> + port_array = xhci->usb3_ports;
> + } else {
> + max_ports = xhci->num_usb2_ports;
> + port_array = xhci->usb2_ports;
> + }
> +
> + if (dev_port_num > max_ports) {
> + xhci_err(xhci, "%s() port number invalid", __func__);
> + return;
> + }
> + status = readl(port_array[dev_port_num - 1]);
> +
> + /* write 1 to clear */
> + if (!(status & PORT_CONNECT) && (status & PORT_CSC))
> + writel(status & PORT_CSC, port_array[0]);
We don't want to write back all the bits we read from the PORTSC register.
Use the xhci_put_state_to_neutral(status) helper function to mask out some RW1C bits.
This in addition to writing to the correct PORTSC register as I previously mentioned.
-Mathias
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